Incandescent-lamp guard.



No. 838,860. PATBNTED DEC. 18, 1906.

. H. HUB-BELL, INGANDBSGENT LAMP GUARD. APPLICATION FILED AUG.1B 1908.

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HARVEY HUBBELL, OF BRIDGEPORT, CONNECTICUT.

lNCANDESCENT-LAMP GUARD.

Specification of Letters Patent.

Patented Dec. 18, 1906.

Application filed August 18, 1906. Serial No. 331,168.

To in whom, it may concern: Be it known that I, HARVEY HUBBELL, citizen of the United States, residing at Bridgeport, county of Fairfield, State of Connecticut, have invented a new and useful Incandescent-Lamp Guard, of which the following is a specification.

This invention relates to detachable guards for the protection of incandescent lamps, and has for its object to simplify and cheapen their construction, to improve their general appearance, and to provide quick and con venient means for attachment and detachment by rotation of the guard itself Without the use of a screw-driver or other tool.

With these and other objects in view I have devised the novel incandescent-lamp guard which I will now describe, referring to the accompanying drawings, forming a part of this specification, and using reference characters to indicate the several parts.

Figure 1 is a sectional elevation showing my novel guard in place upon an incandescent lamp; Fig. 2, a horizontal section on the line 2 2 in Fig. 3 looking in the direction of the arrows; Fig. 3, a section of the upper ring and the attaching-ring on the line 3 3 in Fig. 2 looking in the direction of the arrows, and Fig. 4 is a view of the contractile collar detached.

1O denotes an incandescent lamp, and 11 a standard lamp-socket which is provided with a circumferential rib 12.

The guard, which is made open at the bottom to permit the attachment and detach. ment of a lamp to and from the socket without detaching the guard, comprises an upper ring 13, made of sheet metal and having an inwardly-extending flange 14, a lower ring 15, which may be made of wire, an intermediate ring 16, also preferably of wire and of greater diameter than the lower ring, and longitudinal rods 17. The longitudinal rods are preferably curved outward from the lower ring to the intermediate ring and then inward from the intermediate ring to the upper ring in order to give a graceful configuration to the guard as a whole.

The parts are secured together by the operation of tinning, thus doing away with all soldering and effecting an important saving in the cost of construction. The ends of the longitudinal rods are curved about said lower ring, as at 19, and the rods and rings 15 and 16 are provided with bends at their points of intersection, thus preventing longitudinal displacement of the rods on the rings. The upper ring is provided with inwardly-bent strips 21, which are formed by striking the strips inward, leaving them attached at the ends and curved inward at the center sufiiciently to permit the rods to be passed upward between the inwardly-bent strips and the body of the ring, the ends of the rods bearing against the inwardly-turned flange 14 of said ring, whereby they are braced and securely held in place. structure of the guard itself. The tinning operation is of course required to give the finish to the guard called for by the trade. This tinning operation consists simply in dipping the completed guard in molten tin and quickly removing it.

My novel construction enables me to utilize the tinning operation to rigidly secure the longitudinal rods to the upper ring as the molten tin fills in all the interstices between the parts, thereby rigidly securing them together without the necessity for any soldering operations.

The guard is secured to a lamp-socket by means of an attaching-ring 22 and a contractile collar 23. The attaching-ring is preferably made of uniform diameter with the upper ring, is provided with a threaded collar 24, and is attached to the upper ring after the operation of tinning by means of lips 25, which are struck out from the metal of the attaching-ring and are curved about the flange 14 of the upper ring, as clearly shown in the drawings, thereby locking said parts rigidly together.

By securing the guard and the attachingring together in the manner described the parts become practically a unitary structure, so that the guard can be put on or taken off of the socket by simply grasping the rod portion of the guard and screwing or unscrewing it in a manner similar to that in putting on or taking off the ordinary lamp-bulb. The manner of mounting the longitudinal rods within the bent-in strips aids in permitting such rotating of the guard with the practically integral attaching-ring without liability of breaking or disengaging or disarranging the parts.

The contractile collar is made of spring metal and is self-retaining in place by its own resiliency. It is provided with a circumferential internal groove 26, which. receives rib 12 upon a standard lamp-socket and engages it closely, and with an external This completes the screw-thread 27, which is engaged by the thread of collar 24 on the attaching-ring.

In use the contractile collar is simply sprung to place on the socket, Where it is selfretaining, and then the guard is turned to place on the collar and removed by turning it backward thereon, leaving the collar upon the socket. The lamp may be attached to the socket and detached therefrom without removing the guard.

Having thus described my invention, I claim 1. A guard for incandescent lamps comprising longitudinal rods, lower and intermediate rings, an upper ring having an inwardly-turned flange and inwardly-bent strips curved at the center and attached at the ends, the ends of the rods being passed between the strips and the body of the ring and resting against the flange, a metallic coating for the guard, said coating securing said upper ring and rods together, and means secured to and forming a unitary structure with said ring for attaching the guard to a lamp-socket.

2. A guard for incandescent lamps comprising longitudinal rods, lower and intermediate rings, an upper ring having an inwardly-turned flange and inwardly-bent strips curved at the center and attached at the ends, the ends of the rods being passed between the strips and the body of the ring and resting against the flange, a metallic coating for the guard, said coating securing said upper ring and rods together, and an at taching-ring having a threaded collar, secured to the upper ring by lips struck out from the attaching-ring and engaging the flange of the upper ring.

In testimony whereof in presence of two witnesses.

HARVEY HUBBELL.

Witnesses A. M. WOOSTER, S. W. ATHERTON.

I a'l'liix my signature 

